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1/*
2 * tcp_diag.c Module for monitoring TCP transport protocols sockets.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/net.h>
14#include <linux/sock_diag.h>
15#include <linux/inet_diag.h>
16
17#include <linux/tcp.h>
18
19#include <net/netlink.h>
20#include <net/tcp.h>
21
22static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
23 void *_info)
24{
25 struct tcp_info *info = _info;
26
27 if (inet_sk_state_load(sk) == TCP_LISTEN) {
28 r->idiag_rqueue = sk->sk_ack_backlog;
29 r->idiag_wqueue = sk->sk_max_ack_backlog;
30 } else if (sk->sk_type == SOCK_STREAM) {
31 const struct tcp_sock *tp = tcp_sk(sk);
32
33 r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
34 r->idiag_wqueue = tp->write_seq - tp->snd_una;
35 }
36 if (info)
37 tcp_get_info(sk, info);
38}
39
40#ifdef CONFIG_TCP_MD5SIG
41static void tcp_diag_md5sig_fill(struct tcp_diag_md5sig *info,
42 const struct tcp_md5sig_key *key)
43{
44 info->tcpm_family = key->family;
45 info->tcpm_prefixlen = key->prefixlen;
46 info->tcpm_keylen = key->keylen;
47 memcpy(info->tcpm_key, key->key, key->keylen);
48
49 if (key->family == AF_INET)
50 info->tcpm_addr[0] = key->addr.a4.s_addr;
51 #if IS_ENABLED(CONFIG_IPV6)
52 else if (key->family == AF_INET6)
53 memcpy(&info->tcpm_addr, &key->addr.a6,
54 sizeof(info->tcpm_addr));
55 #endif
56}
57
58static int tcp_diag_put_md5sig(struct sk_buff *skb,
59 const struct tcp_md5sig_info *md5sig)
60{
61 const struct tcp_md5sig_key *key;
62 struct tcp_diag_md5sig *info;
63 struct nlattr *attr;
64 int md5sig_count = 0;
65
66 hlist_for_each_entry_rcu(key, &md5sig->head, node)
67 md5sig_count++;
68 if (md5sig_count == 0)
69 return 0;
70
71 attr = nla_reserve(skb, INET_DIAG_MD5SIG,
72 md5sig_count * sizeof(struct tcp_diag_md5sig));
73 if (!attr)
74 return -EMSGSIZE;
75
76 info = nla_data(attr);
77 memset(info, 0, md5sig_count * sizeof(struct tcp_diag_md5sig));
78 hlist_for_each_entry_rcu(key, &md5sig->head, node) {
79 tcp_diag_md5sig_fill(info++, key);
80 if (--md5sig_count == 0)
81 break;
82 }
83
84 return 0;
85}
86#endif
87
88static int tcp_diag_get_aux(struct sock *sk, bool net_admin,
89 struct sk_buff *skb)
90{
91#ifdef CONFIG_TCP_MD5SIG
92 if (net_admin) {
93 struct tcp_md5sig_info *md5sig;
94 int err = 0;
95
96 rcu_read_lock();
97 md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
98 if (md5sig)
99 err = tcp_diag_put_md5sig(skb, md5sig);
100 rcu_read_unlock();
101 if (err < 0)
102 return err;
103 }
104#endif
105
106 return 0;
107}
108
109static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
110{
111 size_t size = 0;
112
113#ifdef CONFIG_TCP_MD5SIG
114 if (net_admin && sk_fullsock(sk)) {
115 const struct tcp_md5sig_info *md5sig;
116 const struct tcp_md5sig_key *key;
117 size_t md5sig_count = 0;
118
119 rcu_read_lock();
120 md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
121 if (md5sig) {
122 hlist_for_each_entry_rcu(key, &md5sig->head, node)
123 md5sig_count++;
124 }
125 rcu_read_unlock();
126 size += nla_total_size(md5sig_count *
127 sizeof(struct tcp_diag_md5sig));
128 }
129#endif
130
131 return size;
132}
133
134static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
135 const struct inet_diag_req_v2 *r, struct nlattr *bc)
136{
137 inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
138}
139
140static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
141 const struct inet_diag_req_v2 *req)
142{
143 return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
144}
145
146#ifdef CONFIG_INET_DIAG_DESTROY
147static int tcp_diag_destroy(struct sk_buff *in_skb,
148 const struct inet_diag_req_v2 *req)
149{
150 struct net *net = sock_net(in_skb->sk);
151 struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
152 int err;
153
154 if (IS_ERR(sk))
155 return PTR_ERR(sk);
156
157 err = sock_diag_destroy(sk, ECONNABORTED);
158
159 sock_gen_put(sk);
160
161 return err;
162}
163#endif
164
165static const struct inet_diag_handler tcp_diag_handler = {
166 .dump = tcp_diag_dump,
167 .dump_one = tcp_diag_dump_one,
168 .idiag_get_info = tcp_diag_get_info,
169 .idiag_get_aux = tcp_diag_get_aux,
170 .idiag_get_aux_size = tcp_diag_get_aux_size,
171 .idiag_type = IPPROTO_TCP,
172 .idiag_info_size = sizeof(struct tcp_info),
173#ifdef CONFIG_INET_DIAG_DESTROY
174 .destroy = tcp_diag_destroy,
175#endif
176};
177
178static int __init tcp_diag_init(void)
179{
180 return inet_diag_register(&tcp_diag_handler);
181}
182
183static void __exit tcp_diag_exit(void)
184{
185 inet_diag_unregister(&tcp_diag_handler);
186}
187
188module_init(tcp_diag_init);
189module_exit(tcp_diag_exit);
190MODULE_LICENSE("GPL");
191MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * tcp_diag.c Module for monitoring TCP transport protocols sockets.
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 */
7
8#include <linux/module.h>
9#include <linux/net.h>
10#include <linux/sock_diag.h>
11#include <linux/inet_diag.h>
12
13#include <linux/tcp.h>
14
15#include <net/netlink.h>
16#include <net/tcp.h>
17
18static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
19 void *_info)
20{
21 struct tcp_info *info = _info;
22
23 if (inet_sk_state_load(sk) == TCP_LISTEN) {
24 r->idiag_rqueue = sk->sk_ack_backlog;
25 r->idiag_wqueue = sk->sk_max_ack_backlog;
26 } else if (sk->sk_type == SOCK_STREAM) {
27 const struct tcp_sock *tp = tcp_sk(sk);
28
29 r->idiag_rqueue = max_t(int, READ_ONCE(tp->rcv_nxt) -
30 READ_ONCE(tp->copied_seq), 0);
31 r->idiag_wqueue = READ_ONCE(tp->write_seq) - tp->snd_una;
32 }
33 if (info)
34 tcp_get_info(sk, info);
35}
36
37#ifdef CONFIG_TCP_MD5SIG
38static void tcp_diag_md5sig_fill(struct tcp_diag_md5sig *info,
39 const struct tcp_md5sig_key *key)
40{
41 info->tcpm_family = key->family;
42 info->tcpm_prefixlen = key->prefixlen;
43 info->tcpm_keylen = key->keylen;
44 memcpy(info->tcpm_key, key->key, key->keylen);
45
46 if (key->family == AF_INET)
47 info->tcpm_addr[0] = key->addr.a4.s_addr;
48 #if IS_ENABLED(CONFIG_IPV6)
49 else if (key->family == AF_INET6)
50 memcpy(&info->tcpm_addr, &key->addr.a6,
51 sizeof(info->tcpm_addr));
52 #endif
53}
54
55static int tcp_diag_put_md5sig(struct sk_buff *skb,
56 const struct tcp_md5sig_info *md5sig)
57{
58 const struct tcp_md5sig_key *key;
59 struct tcp_diag_md5sig *info;
60 struct nlattr *attr;
61 int md5sig_count = 0;
62
63 hlist_for_each_entry_rcu(key, &md5sig->head, node)
64 md5sig_count++;
65 if (md5sig_count == 0)
66 return 0;
67
68 attr = nla_reserve(skb, INET_DIAG_MD5SIG,
69 md5sig_count * sizeof(struct tcp_diag_md5sig));
70 if (!attr)
71 return -EMSGSIZE;
72
73 info = nla_data(attr);
74 memset(info, 0, md5sig_count * sizeof(struct tcp_diag_md5sig));
75 hlist_for_each_entry_rcu(key, &md5sig->head, node) {
76 tcp_diag_md5sig_fill(info++, key);
77 if (--md5sig_count == 0)
78 break;
79 }
80
81 return 0;
82}
83#endif
84
85static int tcp_diag_put_ulp(struct sk_buff *skb, struct sock *sk,
86 const struct tcp_ulp_ops *ulp_ops)
87{
88 struct nlattr *nest;
89 int err;
90
91 nest = nla_nest_start_noflag(skb, INET_DIAG_ULP_INFO);
92 if (!nest)
93 return -EMSGSIZE;
94
95 err = nla_put_string(skb, INET_ULP_INFO_NAME, ulp_ops->name);
96 if (err)
97 goto nla_failure;
98
99 if (ulp_ops->get_info)
100 err = ulp_ops->get_info(sk, skb);
101 if (err)
102 goto nla_failure;
103
104 nla_nest_end(skb, nest);
105 return 0;
106
107nla_failure:
108 nla_nest_cancel(skb, nest);
109 return err;
110}
111
112static int tcp_diag_get_aux(struct sock *sk, bool net_admin,
113 struct sk_buff *skb)
114{
115 struct inet_connection_sock *icsk = inet_csk(sk);
116 int err = 0;
117
118#ifdef CONFIG_TCP_MD5SIG
119 if (net_admin) {
120 struct tcp_md5sig_info *md5sig;
121
122 rcu_read_lock();
123 md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
124 if (md5sig)
125 err = tcp_diag_put_md5sig(skb, md5sig);
126 rcu_read_unlock();
127 if (err < 0)
128 return err;
129 }
130#endif
131
132 if (net_admin) {
133 const struct tcp_ulp_ops *ulp_ops;
134
135 ulp_ops = icsk->icsk_ulp_ops;
136 if (ulp_ops)
137 err = tcp_diag_put_ulp(skb, sk, ulp_ops);
138 if (err)
139 return err;
140 }
141 return 0;
142}
143
144static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
145{
146 struct inet_connection_sock *icsk = inet_csk(sk);
147 size_t size = 0;
148
149#ifdef CONFIG_TCP_MD5SIG
150 if (net_admin && sk_fullsock(sk)) {
151 const struct tcp_md5sig_info *md5sig;
152 const struct tcp_md5sig_key *key;
153 size_t md5sig_count = 0;
154
155 rcu_read_lock();
156 md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
157 if (md5sig) {
158 hlist_for_each_entry_rcu(key, &md5sig->head, node)
159 md5sig_count++;
160 }
161 rcu_read_unlock();
162 size += nla_total_size(md5sig_count *
163 sizeof(struct tcp_diag_md5sig));
164 }
165#endif
166
167 if (net_admin && sk_fullsock(sk)) {
168 const struct tcp_ulp_ops *ulp_ops;
169
170 ulp_ops = icsk->icsk_ulp_ops;
171 if (ulp_ops) {
172 size += nla_total_size(0) +
173 nla_total_size(TCP_ULP_NAME_MAX);
174 if (ulp_ops->get_info_size)
175 size += ulp_ops->get_info_size(sk);
176 }
177 }
178 return size;
179}
180
181static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
182 const struct inet_diag_req_v2 *r, struct nlattr *bc)
183{
184 inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
185}
186
187static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
188 const struct inet_diag_req_v2 *req)
189{
190 return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
191}
192
193#ifdef CONFIG_INET_DIAG_DESTROY
194static int tcp_diag_destroy(struct sk_buff *in_skb,
195 const struct inet_diag_req_v2 *req)
196{
197 struct net *net = sock_net(in_skb->sk);
198 struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
199 int err;
200
201 if (IS_ERR(sk))
202 return PTR_ERR(sk);
203
204 err = sock_diag_destroy(sk, ECONNABORTED);
205
206 sock_gen_put(sk);
207
208 return err;
209}
210#endif
211
212static const struct inet_diag_handler tcp_diag_handler = {
213 .dump = tcp_diag_dump,
214 .dump_one = tcp_diag_dump_one,
215 .idiag_get_info = tcp_diag_get_info,
216 .idiag_get_aux = tcp_diag_get_aux,
217 .idiag_get_aux_size = tcp_diag_get_aux_size,
218 .idiag_type = IPPROTO_TCP,
219 .idiag_info_size = sizeof(struct tcp_info),
220#ifdef CONFIG_INET_DIAG_DESTROY
221 .destroy = tcp_diag_destroy,
222#endif
223};
224
225static int __init tcp_diag_init(void)
226{
227 return inet_diag_register(&tcp_diag_handler);
228}
229
230static void __exit tcp_diag_exit(void)
231{
232 inet_diag_unregister(&tcp_diag_handler);
233}
234
235module_init(tcp_diag_init);
236module_exit(tcp_diag_exit);
237MODULE_LICENSE("GPL");
238MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);